Direct Ventilation Design. Smart Ventilation Units.

Transcription

1 Direct Ventilation Design Smart Ventilation Units Rev: 2 01/08/2018

2 Optimum indoor climate, minimum energy usage The air is damp and warm. Your eyes are dry and irritated. Your head seems heavy and you have difficulties concentrating. A poor indoor climate has a big impact on our ability to function and well-being in our daily life. Surveys show that a poor indoor climate negatively impacts our performance levels by up to 10%. For children this impact is even greater * That is why we need a world-class indoor climate. * Geo Clausen, International Centre for Indoor Environment and Energy, Technical University of Denmark. CONTENTS EXCESSIVELY HIGH HUMIDITY 4 TRAPPED IN A BAG? 6 HIGH CO 2 LEVELS CAN DAMAGE YOUR HEALTH 8 DRAUGHT CHALLENGE 10 TEMPERATURE CONTROL 12 NOISE DISTURBANCE 14 AIRBORNE POLLUTION 16 FLYING BLIND? 18 AIRMASTER EXAMPLES 21 SIZING OF AIRMASTER SVUs 22 AIRMASTER SVUs AT A GLANCE 25 TECHNICAL DATA SUMMARY 26 AIRMASTER IN ACTION 27 2

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4 EXCESSIVELY HIGH HUMIDITY THE TYPICAL SIGNS OF EXCESSIVELY HIGH HUMIDITY ARE: Heavy levels of condensation on the inside of window panes Damp stains on ceilings and/or walls Wallpaper bubbling and coming off the wall Drawers and doors sticking Mould and resulting physical discomfort 4

5 Lack of ventilation increases the relative humidity in the rooms we use. Excessively high humidity allows dust mites to multiply and poses a risk of mould. DUST MITES Dust mites measure mm and cannot be seen with the naked eye. They thrive in high humidity, i.e % RH (RH = relative humidity) and reproduce at a speed that is directly linked to room temperature and humidity. They absorb humidity through their skin so if humidity is kept below 45% RH, they will dry out and die. WHAT SHOULD YOU DO? You should ventilate the room but in the right way! Decentralised ventilation with heat recovery ensures that nothing is left to chance. A decentralised ventilation unit that automatically adapts the flow of fresh air to each room provides an indoor climate that is both healthy and financially viable. MOULD A typical result of lack of ventilation is that mould develops inside the building. Mould spores contain substances that are harmful to people and animals. 5

6 TRAPPED IN A BAG? More stringent building regulations mean that renovation projects and new-builds are now very airtight so airtight that it almost feels like being trapped in a bag. 6

7 BUILDINGS NEED TO BREATHE Buildings should be tight but they should still be able to breathe. This sounds contradictory. What we mean is that buildings should be tight so that we do not use too much energy on heating and that they should be able to breathe in order for humid and used air to escape. Buildings should not breathe through random holes, but through controlled and on-demand ventilation. OUR HEALTH IS AT STAKE Not all buildings have a good indoor climate. This is often because the building contains too much humidity. This can cause both health-related and financial problems. For the building this can mean rot and mould in the structure, which can give us asthma and allergies if they are allowed to develop. More and more people are diagnosed with asthma and allergies, and part of the explanation is a poor indoor climate. DID YOU KNOW THAT high levels of CO 2, high room temperature and high humidity = a poor indoor climate.... we need to open doors and windows wide to create a draught two to three times a day for 5-10 minutes - to maintain a healthy indoor climate.... indoor air is full of volatile organic compunds (VOC) from e.g. furniture, floor coverings, electronics and painted surfaces. These need to be kept under control by regular ventilation. 7

8 HIGH CO 2 LEVELS CAN DAMAGE YOUR HEALTH Air has several components, the main ones being oxygen, nitrogen and CO 2. These need to be in their natural balance. However, we have all walked into a room where the air feels stuff, which is an indicator that CO 2 is high. Increased indoor CO 2 levels are a result of human activity. To restore the air s natural balance, used stale air must be removed and replaced by fresh air. Thus, CO 2 levels serve as a good indicator of whether ventilation is sufficient for the number of people in the room. Exposure to high levels of CO 2 is a health risk and can lead to conditions such as: Headache Dizziness Fatigue Restlessness Pins and needles in your legs Respiratory difficulties High blood pressure DIFFERENT EFFECTS OF CO 2 LEVELS ppm is the normal level of CO 2 in occupied rooms with a good supply of fresh air o Natural Ventilation > CO 2 (ppm) Mechanical Ventilation At ppm you will usually feel tired and find it hard to concentrate. At ppm you will probably have a headache, and generally feel unwell. Above 5000 ppm the human body is subject to CO 2 poisoning Daily Average CO 2 allowed as per the latest BB101 8

9 AN EVERYDAY EXAMPLE CO 2 measurements taken in a traditional classroom at Gl. Hasseris School, mainland Denmark show very clearly how vital good ventilation is for air quality. The blue line shows the level of CO 2 with an AirMaster SVU in operation. The red line shows measurements taken in the same room without ventilation. Figure 1 shows measurements taken over one school day and Figure 2 shows measurements taken over a whole school week. The results are unequivocal. Without ventilation CO 2 levels increased to 2000 ppm during just one lesson. Seen on the basis of how many hours we spend in nurseries, in educational establishments and at work these results are both thought-provoking and alarming. With AirMaster With AirMaster 2500 Without AirMaster 2500 Without AirMaster CO 2 concentration (ppm) :00 08:00 09:00 10:00 11:00 12:00 13:00 Day 1 Day 2 Day 3 Day 4 CO 2 Concentration (ppm) Day 5 Figure 1 Figure 2 9

10 DRAUGHT CHALLENGE AIR VOLUME To properly ventilate a classroom with 32 pupils and teachers requires approximately 6 air changes per hour (ACH). This means that every 10 minutes, the complete room contents of stale air need to be exchanged with fresh air, therefore, during winter time with low external temperatures, the possibility of draught caused by the incoming fresh air is very real. Fresh Air - In 10 MINUTES = 1 AIR CHANGE Change 1 60 MINUTES Change 2 Change 1 Change 3 Change 2 Change 4 Change 3 Change 5 Change 4 Change 6 Change 5 Change 6 Stale Air - Out Figure 3. 6 ACH for good classroom ventilation - that s a lot of fresh air! AIR VELOCITY AND AIR TEMPERATURE Draught is produced by a combination of low temperature and high air movement. The sensation of draught is produced in schools when pupils are required to sit too close to unregulated openings in colder weather. Without tempering, inlet air arriving at any temperature up to 16 C is unable to remain buoyant and would make its way sharply downwards to the occupied zone, creating discomfort for any child in the path of this air plume (Figure 4). Low entry velocity, e.g. 0.5 m/s Warm 16 C 21 C Cold Figure 4. Draught caused by cold temperature 10

11 DRAUGHT FREE VENTILATION BY THE COANDA EFFECT In contrast, AirMaster SVUs are designed to bring fresh air into a classroom at a closely controlled temperature, usually 19 C. This inlet air stays close to the ceiling as it moves along (using the Coanda effect), well out of reach of the occupants below. (Figure 5). As this fresh air makes its way across the ceiling, it entrains existing room air with two important results: firstly, that the incoming air slows down to a barely noticeable 0.15 m/s velocity; secondly, that the fresh air is warmed up to the temperature of the room air, say 21 C. High entry velocity, e.g. 3-4 m/s 19 C 22 C 0.15 m/s Warm Natural Ventilation 5 ºC 4.5 ºC Mechanical Ventilation 21 C Figure 5. Draught-free ventilation by Coanda Effect Cold Figure 6. Allowable Dt between occupied zone and supply air as per the latest BB101 To prevent the Coanda effect from being disrupted, ideally the ceiling surface in front of the SVU should be flat and free from obstructions such as pipework and light fittings. Ceiling beams would present a challenge if located perpendicular to the air pathway. However, if the SVU throw can be located parallel to any ceiling beams, then air distribution is still likely to be effective. If it is not possible to achieve a flat ceiling surface in front of the SVUs, then floor standing units should be considered instead. By the time the fresh air flow has reached the back wall, it will have warmed up and slowed down sufficiently to provide draught-free fresh air to the classroom. Hence the term smart ventilation unit (SVU) - it controls inlet temperature, eliminates draught and keeps CO 2 under control, all at the same time. CO2 Level (ppm) ºC -5 ºC 0 C 5 C 10 C 15 C External Temperature Mean Level CO 2 (ppm) Daily Allowable Average (Nat Vent) Daily Allowable Average (Mech Vent) DID YOU KNOW THAT To achieve a supply temperature of 19 C the ratio of room air to fresh air can reach 10:1 at -10 C when using mixer boxes, meaning CO 2 content in classrooms can be expected to go above the allowable daily average. Figure 7. Expected CO 2 level in classroom with occupancy of 32 relative to external temperature for mixer boxes with 19ºC supply air. 11

12 TEMPERATURE CONTROL AirMaster heat exchangers are fundamental to the temperature control of supply air. By having wide pathways through the exchanger, obstruction to airflow is kept to a minimum. With exchanger efficiencies of at least 84% in dry conditions, supply temperature can therefore be kept closely to the set point which assists with the issue of eliminating draught. Figure 8. AirMaster Aluminium Counter-Flow Heat Exchanger Mode: Fan Differential Speed Outdoor Temperature: -5 C Inlet Set Temperature: 19 C 5.1 ºC -5 ºC EXHAUST AIR OUTDOOR AIR If Inlet Temperature is > 1 C below the set point, correction is by fan differential speed. Fan 1 slows down and Fan 2 speeds up, so that a reduced volume of fresh air is warmed by an increased flow of room air, thus returning supply temperature to set point. FAN 2 SPEED 725 m 3 /hr MAIN DAMPER BYPASS DAMPER FAN 1 SPEED 696 m 3 /hr 21 ºC ROOM AIR HEAT EXCHANGER 17.1 ºC SUPPLY AIR Mode: Balanced Ventilation Outdoor Temperature: 5 C Inlet Set Temperature: 19 C If Inlet Temperature is 1 C below the set point, Fan 1 and Fan 2 operate in balanced mode (both fans running at the same speed). 7.9 ºC 5 ºC EXHAUST AIR FAN 2 SPEED 725 m 3 /hr MAIN DAMPER BYPASS DAMPER FAN 1 SPEED 725 m 3 /hr OUTDOOR AIR 21 ºC ROOM AIR HEAT EXCHANGER 18.1 ºC SUPPLY AIR 12

13 DID YOU KNOW THAT The AM 800 SVU recovers 21 times more energy than is used to run it and saves 4.49 / week in winter conditions.* *Notes: Assuming an outside temperature (OT) of 5 C, inlet supply temperature of 19 C, then heat recovered = Φ = x 725 x (19 5) = 3.42 kw Running power required by AM 800 = 0.16 kw for 1 week s operation in winter conditions (OT = say, 5 C), Assuming gas cost per unit = / kwhr, boiler efficiency = 90%, Savings per unit = ( ) x 5 x 8 x x 1/0.9 = 4.49 / week. Mode: Automatic Bypass Outdoor Temperature: 30 C Inlet Set Temperature: 19 C 28.3 ºC 30 ºC OUTDOOR AIR EXHAUST AIR If Inlet Temperature is > 2 C above the set point, the bypass damper opens automatically in increments of 10% whilst FAN 2 SPEED 725 m3/hr the main damper closes at the same time. A proportion of the incoming air is MAIN DAMPER diverted away from the heat exchanger. FAN 1 BYPASS DAMPER SPEED 725 m3/hr If incoming air is not able to reduce the 28.4 ºC achieved inlet temperature, the bypass ROOM AIR damper opens and the main damper HEAT EXCHANGER closes 100%. If the bypass damper is open at 100% and Dt is still 2 C, supply and exhaust fan increase speed to 100% SUPPLY AIR 29.1 ºC to use convective cooling. Mode: Night Time Cooling Outdoor Temperature: 12 C Inlet Set Temperature: 16 C 12.5 ºC During periods of heat waves, Night 12 ºC OUTDOOR AIR EXHAUST AIR Time Cooling is a feature that introduces cooler air at minimum inlet of 16 C between midnight and 6am to cool down the thermal mass of the room. External air is introduced either fully or partially via the bypass damper directly FAN 2 SPEED 725 m3/hr MAIN DAMPER FAN 1 BYPASS DAMPER SPEED 725 m3/hr 26 ºC into the room space. By keeping the inlet ROOM AIR temperature above 16 C, thermal stress and unwanted condensation effects HEAT EXCHANGER are avoided. In the morning, the room temperature is lower than it otherwise SUPPLY AIR might be, providing a fresh feel and 16 ºC delaying the onset of any overheating. 13

14 NOISE DISTURBANCE NOISE CONTROL TO IMPROVE CLASS ATTENTION There are two important features which make AirMaster SVUs suitable for environments where quiet operation is paramount, even when there are undesirable local noise sources: Casing breakout noise of no more than 35 db(a) at 100% throughput measured at 1m from the unit Attenuation of external noise of 49 db The low level of casing breakout noise of AirMasters helps to meet the requirements under BB 93. This compares favourably against other ventilation manufacturers, who often quote noise emission of 35 db(a) but at 3m from their equipment. To put the different suppliers on a level playing field, 35 db(a) at 1m is equivalent to 25 db (A) at 3m, emphasising just how quiet AirMaster SVUs are. In rooms where occupants are likely to be more sensitive to noise, for example SEN classrooms and music rooms, it is possible to limit fan speed to 80% of full throughput, with a resultant fall in casing breakout noise to 30 db(a), again at 1m. 14

15 AirMaster ventilation solutions are characterised by high performance at a very low noise level. Sound Pressure (db(a)) T = 0.9 s T = 0.6 s Airflow (m 3 /h) Figure 9. Sound Pressure Levels for 1 x AM 500 unit Noise attenuation of AirMasters is a decisive factor for any acoustic consultant tasked with finding viable solutions to deal with high external noise. For example for a SEN school project with specified SVUs, external noise from an A road was found to be 63 db(a) at the school building boundary. However, after passing through an AirMaster SVU, the resultant level was no more than 10.2 db(a), effectively rendering it inaudible to occupants. 15

16 AirMaster SVUs come with M5 air filters as standard, providing a sound measure of protection against airborne pollutants. 16

17 AIRBORNE POLLUTION AIR FILTRATION FOR PROTECTING OCCUPANTS AND HEAT EXCHANGER Urban centres in the UK now have the most polluted air in Europe, with diesel particulates among the worst offenders. For schools located in such cities, the need for filtration of air entering a classroom is thus self-apparent. AirMaster SVUs come with M5 air filters as standard, providing a sound measure of protection against airborne pollutants. Should the required indoor air quality be critical, the inlet filter can be upgraded to F7 or even F9. Filters are placed on both the intake and extract pathways: the intake filter removes breathable contaminants from incoming air whereas both filters act to prevent in-room pollutants from reaching the unit s heat exchanger. This aims to keep the SVU internal surfaces clean, thereby ensuring that the heat exchanger operates at maximum efficiency and fulfils its life expectancy. Figure 10. Comparison of a used / unused filter shows how effective AirMaster is at removing pollutants. Annual maintenance of SVUs is recommended, which includes both service and filter change. Access to reach the filters is straightforward, helping to keep scheduled service time to a low 10 to 15 minutes per unit. The on-board data logger keeps track of running hours since last filter change. Should operational hours exceed those programmed for filter change without action being taken, an alarm signal would be generated. Given regular maintenance, AirMaster SVUs can be expected to enjoy at least a 15-year lifespan. 17

18 FLYING BLIND? REMOTE MONITORING FOR TOTAL CONTROL Remote monitoring and control of AirMaster SVUs is possible by using the Airlinq Online feature. This means that the running condition and performance of any AirMaster SVU can be observed from any location via the Airlinq Online website. It is recognised that the people or organisation given responsibility for the upkeep / maintenance of ventilation equipment may not necessarily have immediate access to the units themselves. This effectively is what Airlinq Online makes possible. It can thus be a viable and cost-effective alternative to Building Management Systems (BMS). Airlinq Online modules are integrated within the SVU s control box and are normally connected to the building s network via an ethernet port. The option of using mobile signals is also available. Investigation of reported faults can be done without leaving the office. Offsite diagnosis has the potential for significant savings in terms of travel and man-hours saved. The record of CO 2 levels and temperature provides the evidence of operational effectiveness. In an era where manpower resources are increasingly under pressure, Airlinq Online extends the reach of any in-house maintenance or FM manager. Figure 11. Example of Graphical Reporting Figure 12. Typical User Interface 18

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20 auto auto auto auto auto auto auto auto auto auto auto STAND-ALONE NETWORK Classroom 1 Classroom 2 Orbit Master Control Panel Viva Local Room Control Classroom 20 Classroom 3 2 x 2 x 0.6 STP (Cat 5, 5e or 6) NETWORK CONNECTED TO MAIN DIGITAL BMS Viva Local Room Control Classroom 1 Classroom 2 2 x 2 x 0.6 STP (Cat 5, 5e or 6) Classroom 20 Classroom 3 Digital BMS NETWORK FOR REMOTE MONITORING Orbit Master Control Panel Classroom 1 Classroom 2 Viva Local Room Control 2 x 2 x 0.6 STP (Cat 5, 5e or 6) Classroom 20 Classroom 3 Airlinq Online Module in Master Unit Figure 13. User Interface Control Options 20

21 AIRMASTER EXAMPLES 21

22 SIZING OF AIRMASTER SVUs There are multiple methods used by SAV to size SVUs, as detailed below. CO 2 CONCENTRATION CALCULATION SAV Systems use a manufacturer-developed tool, the CO 2 Concentration Calculator, to simulate rooms served by AirMaster SVUs to determine the average expected CO 2 level, based on the following factors: 1. Room volume 2. Occupancy 3. School timetable 4. External CO 2 levels 5. AirMaster SVU selection To aid consultants in sizing ventilation for classrooms, given points 1 to 3 of the above, it is possible to determine which combination of AirMaster SVUs will keep the daily average CO 2 level below the required 1,000 ppm. Point 4 can be inferred from the location and online data, with typical external CO 2 levels being around 400 ppm. From this information point 5 can be calculated the best option for the room in question. EXAMPLE 1 CLASSROOM WITH 32 OCCUPANTS Classrooms in schools are typically occupied by 30 students and 2 staff (teacher and support). Sizing is based on achieving an average CO 2 concentration of less than 1,000 ppm per day for the occupied period, which is defined as 09:00 to 16:00. The following assumptions have been made: Room size of 60m 2 with a ceiling height of 2.4m, giving a volume of 144m 3 A timetable which includes one period where the room is empty. This has been found to be typical of a school day as students often have specialised subjects in other classrooms, such as laboratories. The same theory applies to specialist rooms as they are often not used for full days CO 2 Concentration (ppm) Constant Flow CO 2 Sensor Time Figure 14. Simulated CO 2 output for classroom with 32 occupants Average CO 2 level with CO 2 sensor: 967 ppm, with the maximum allowable level of 1,500 ppm never exceeded. Unit selected: 1 no. AM 800 with CO 2 sensor and local control panel 22

23 EXAMPLE 2 CLASSROOM WITH 14 OCCUPANTS (SEN SCHOOL) Classrooms in SEN schools are typically occupied by 12 students and 2 staff (teacher and support). In this example, sizing is based on achieving an average CO 2 concentration of less than 1,000 ppm for the occupied period, with special attention to reduced noise emission. The following assumptions have been made: Room size of 56m 2 with a ceiling height of 2.6m, giving a volume of 146m 3 A timetable which includes one period where the room is empty, for example, for art classes Casing breakout noise not exceeding 30 db(a) at 1m, to meet SEN requirements. AirMaster SVU units can meet this by restricting flow to a maximum of 80% of full throughput CO 2 Concentration (ppm) Constant Flow CO 2 Sensor Time Figure 15. Simulated CO 2 output for SEN classroom with 14 occupants Average CO 2 level with CO 2 sensor: 873 ppm, with the maximum allowable level of 1,500 ppm never exceeded. Unit selected: 1 no. AM 500 at 80% turndown to achieve 30 db(a) with CO 2 sensor (control panel ommitted due to SEN requirement). PERSONAL REQUIREMENT METHOD For rooms used by adults (e.g. offices and staff rooms) sizing is normally assessed by personal requirement (l/s/person) calculation. In such cases, room occupancy is required and the personal requirement confirmed, typically 10 l/s/p. AirMaster flow rates are in m 3 /h, so a factor of 3.6 is used to convert from l/s to m 3 /h. The following formula applies: Number of occupants requirement per person (l/s) 3.6 = Capacity of air required (m 3 /h) EXAMPLE 3 OFFICE WITH 1-4 OCCUPANTS (ADULTS) For one person offices, anticipated occupancy may increase for small meetings. Sizing could be considered for up to 4 occupants based on 10 l/s/p. This gives the following: 4 occ. x 10 l/s/p x 3.6 = 144m 3 /h. Consequently, the recommendation would be for an AM 150 unit. Due to the varying occupancy levels, but guaranteed regular use, a CO 2 sensor could be considered for this application, enabling the unit to turn down during low occupancy periods and ramp up as necessary. Unit selected: 1 no. AM 150 with CO 2 sensor and local control panel 23

24 EXAMPLE 4 GROUP ROOMS WITH 6-8 OCCUPANTS Due to these rooms being used by mixed adult/child groups, sizing is usually based on 10 l/s/p. Taking the higher case of 8 occupants gives the following: 8 occ. x 10 l/s/p x 3.6 = 288m 3 /h. Therefore, the recommendation would be for 1 no. AM 300. Anticipating irregular occupancy times, a PIR sensor would be recommended to increase fan speed to 100% when occupancy is detected. During vacant periods, the SVU could be programmed to slow to full turndown or stop completely. A CO 2 sensor would not normally be required. Fan speed would decrease to full turndown. Unit selected: 1 no. AM 300 with PIR sensor and local control panel FLOOR AREA Laboratories can be sized based on room floor area, with a typical requirement of 4 l/s/m 2 for floor areas greater than 70m 2. They are often required to have higher flow rates due to the nature of activities and the type of consumables used. Laboratories may also require the ability to boost flow, or have an auxiliary extraction system. To calculate air flow required for this size of laboratory, the following formula is used: Capacity of air required (m 3 /h) = floor area (m 2 ) 4 (l/s/m 2 ) 3.6 Laboratories with a smaller floor area may be served by different criteria. EXAMPLE 5 LABORATORY WITH A FLOOR AREA OF 75m 2 75m 2 x 4 l/s/m 2 x 3.6 = 1,080m 3 /h Unit selected: 1 x AM 1000 with CO 2 sensor and local control panel AIR CHANGES PER HOUR (ACH) Air flow requirements can be determined based upon air changes per hour, in medical treatment rooms for example. This can be calculated by using the following formula: Room volume (m 3 ) ACH = Capacity of air required (m 3 /h) EXAMPLE 6 LABORATORY WITH DIMENSIONS OF 6 m (L) X 5 m (W) X 2.4m (H) Typical values for air changes per hour (ACH) are 4-6 ACH. Therefore, working on a worst-case scenario basis of 6 ACH and inputting into the formula gives: ( ) 6 = 432m 3 /h Unit selected: 1 x AM 500 and local control panel It is worth noting, for both Examples 5 and 6, that although the ventilation requirements for both floor area and air changes per hour have been met, sizing may also need to be considered on a basis of occupancy. This is to avoid blatant mismatches with respect to personal requirement guidelines. 24

25 AIRMASTER SVUs AT A GLANCE Good Indoor Air Quality with the windows shut Low Noise: only 35 1m Demand Control links Fan Speed to Room CO 2 Content 49 db Attenuation of external noise CO 2 or PIR Control Reduces OPEX Duct Free Air Distribution Recovers 82% (Dry Bulb) of heat contained in Extract Air Easy to Install in New-build or Retrofits 30% Turndown by Fan Motors = Energy Savings Temperature Control by Automatic Bypass, Night Cooling & Cooling Modules Low Specific Fan Power w/l/sec M5 / F7 Air Filters Aluminium Heat Exchangers 25

26 TECHNICAL DATA SUMMARY Wall mounted units Floor standing units AM Maximum capacity at 35 db(a) m 3 /h Maximum capacity at 30 db(a) m 3 /h Throw (max.) m Weight (ventilation units without options) kg Colour, panels RAL 9010 (white) Dimensions (L x D) mm 1170 x x x x x x x 496 Dimension (H) mm Min. room height for horizontal intake/exhaust mm Min. room height for vertical intake/exhaust mm Electrical connection Ph & V 1~230 1~230 1~230 1~ ~230 3~230 Frequency Hz Power consumption (max.) W Operating current A Power factor SFP at maximum capacity w/l/sec CC Cooling unit Cooling capacity W Power consumption W Operating current A Leakage current (max.) ma Weight kg Electrical heating surface Electrical heating surface (comfort heating) W Water heating surface Capacity at flow/return temperature of 70/40 C W Capacity at flow/return temperature of 65/35 C W CONTROL OPTIONS In-built data logger CO 2 sensor PIR motion sensor Humidity sensor BMS interface module Thermostat Online control 26

27 Schools Offices Colleges Universities Nurseries Hospitals AIRMASTER IN ACTION Clinics Care Homes Hotels Fitness Studios MOD Facilities 27

28 For further information please contact: Head Office: SAV Systems Scandia House, Boundary Road Woking, Surrey GU21 5BX Tel: +44 (0) South West: SAV Systems 16 Gay Street, Bath BA1 2PH Tel: +44 (0) North West: SAV Systems 11 St John Street, Manchester M3 4DW Tel: +44 (0) Scotland: SAV Systems 49 Manor Place, Edinburgh EH3 7EG Tel: +44 (0) Web: LinkedIn: